1 files changed, 52 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0018-Add-a-workaround-to-cover-VGA-memory-size-bug-in-A0.patch b/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0018-Add-a-workaround-to-cover-VGA-memory-size-bug-in-A0.patch
new file mode 100644
index 000000000..250ca7f5c
--- /dev/null
+++ b/meta-openbmc-mods/meta-ast2600/recipes-bsp/u-boot/files/0018-Add-a-workaround-to-cover-VGA-memory-size-bug-in-A0.patch
@@ -0,0 +1,52 @@
+From d7cdcbd4222ef3ad6d532c1034f4649432b0a69d Mon Sep 17 00:00:00 2001
+From: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
+Date: Thu, 18 Jun 2020 15:08:57 -0700
+Subject: [PATCH] Add a workaround to cover VGA memory size bug in A0
+
+AST2600 A0 has a silicon bug which requires setting of VGA memory
+size limit. This commit add VGA memory size setting of 8MB for A0
+and 16MB for A1.
+
+Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
+---
+ arch/arm/mach-aspeed/ast2600/platform.S | 17 +++++++++++++++++
+ 1 file changed, 17 insertions(+)
+
+diff --git a/arch/arm/mach-aspeed/ast2600/platform.S b/arch/arm/mach-aspeed/ast2600/platform.S
+index aaacb61a1f8b..7e6787e5c6db 100644
+--- a/arch/arm/mach-aspeed/ast2600/platform.S
++++ b/arch/arm/mach-aspeed/ast2600/platform.S
+@@ -213,6 +213,12 @@ do_primary_core_setup:
+ 
+ 	bne	0f
+ 
++	/* limit VGA memory size to 8MB (A0 bug) */
++	ldr	r0, =AST_SCU_HW_STRAP1_CLR
++	movw	r1, #0x6000
++	movt	r1, #0x0000
++	str	r1, [r0]
++
+ 	/* tune up CPU clocks (A0 only) */
+ 	ldr	r0, =AST_SCU_HW_STRAP1
+ 	ldr	r1, [r0]
+@@ -251,6 +257,17 @@ wait_lock:
+ 	bne	2f
+ 
+ 1:
++	/* set VGA memory size to 16MB (A1 only) */
++	ldr	r0, =AST_SCU_HW_STRAP1_CLR
++	movw	r1, #0x4000
++	movt	r1, #0x0000
++	str	r1, [r0]
++
++	ldr	r0, =AST_SCU_HW_STRAP1
++	ldr	r1, [r0]
++	orr	r1, #0x2000
++	str	r1, [r0]
++
+ 	/* disable DMA arbitration on MAC1 (A1 bug) */
+ 	ldr	r0, =AST_MAC1_CTRL2
+ 	ldr	r1, [r0]
+-- 
+2.17.1
+